Huge Memory Leak - Need help.

Hi,
There is a huge memory leak in our application. Because of this there are frequent session timeout. When we analysed the heap dump using Memory Analyser Tool, we got the leak suspects and the problem suspects are as below:
One instance of "org.apache.jasper.compiler.JspRuntimeContext" loaded by "org.apache.catalina.loader.StandardClassLoader @ 0x87ff8098" occupies 161,832,200 (23.30%) bytes. The memory is accumulated in one instance of "java.util.concurrent.ConcurrentHashMap$Segment[]" loaded by "<system class loader>".
One instance of "org.apache.catalina.tribes.tipis.LazyReplicatedMap" loaded by "org.apache.catalina.loader.StandardClassLoader @ 0x87ff8098" occupies 133,578,920 (19.23%) bytes. The memory is accumulated in one instance of "java.util.concurrent.ConcurrentHashMap$Segment[]" loaded by "<system class loader>".
185 instances of "org.apache.jasper.runtime.BodyContentImpl", loaded by "org.apache.catalina.loader.StandardClassLoader @ 0x87ff8098" occupy 133,502,776 (19.22%) bytes.
What could be the root cause for this error and how to resolve this?

First, in general you not provided enough details to get any help. OS? OS version? Hardware specifics?
Second, are you running custom code? If so, post it so you can get help.
Third, if you're not running custom code, the odds of you having a "huge memory leak" are pretty small.

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TYPE TNumberList IS TABLE OF NUMBER INDEX BY BINARY_INTEGER;
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BEGIN
rds_mdt_test.test_plsql_table (1);
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x TNumberList;
BEGIN
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or
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x TNumberList;
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x.DELETE(indx);
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or
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I will be appreciated for any help.
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Dmitriy.

Thank you, William!
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declare
type TTab is table of ... index binary_integer;
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PROCEDURE test_str_tab(cnt INTEGER);
x TTab2;
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Being a rookie, I thought memory leaks weren't
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>
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Huge Memory Leak, CPU Usage

We are noticing in several of our apps a very bad memory
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Thanks,
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"Ben Spink" <[email protected]> wrote in
message
news:gonn46$afd$[email protected]..
> How would either of those resolve the issue?
AFAIK, there are no inbuilt memory leak problems with using
an enterFrame
event handler. LiveCycle Data Services will push the
information to you, so
you don't have to constantly try to pull, so to speak..
> I'm just looking for a fast timer situation that is
polling my queue for
> any
> requests that need to be sent.
>
> More importantly...why does this issue exist? Why hasn't
this issue been
> fixed...it seems its been around for quite some time.
It's possible that it's not Flex, but you. Are you constantly
adding event
listeners without removing them? Are you removing objects
from the stage
without removing all references to them?
> I can't leave my browser open in the background if I
have a flex app open.
> Its going to hang my browser and system...as its already
done during a a
> live
> demo to a customer.
>
> There are other bugs, and I can excuse them, but
something as basic as
> this
> creating a memory leak is really terrible.
I wouldn't be so quick to blame Flex. You have to make sure
you clean up
after yourself, or you can cause these types of issues with
your code.

Huge Memory Leak - Simple To Reproduce

I have an application that updates the display every so often using a timer, and as I run the application it comsumes increasingly more memory. After some extensive effort I narrowed it down to a very simple scenario:
The code below creates a 40x30 matrix of objects that extend UIComponent (the same problem exists if I extend Sprite). A timer fires every 3 seconds and repaints each object with a random color on updateDisplayList(). Running this (whether from Flex IDE or swf) produces an infinitely increasing memory leak, even though no new memory should be allocated on each timer event. I see an increase of roughly .5MB to 1MB with each call. Calling gc() explicitly (which I know I shouldn't) doesn't help. I'm using Flex Builder 3.
What am I missing? Is this a known bug? Any comment would be greatly appreciated.
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" applicationComplete="startUp();" horizontalAlign="left">
    <mx:Script>
        <![CDATA[
         private var _myUIObjects:Array = new Array();
            private var _timer:Timer = new Timer(3000);
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             var myUIObject:MyUIObject;
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              myUIObject = new MyUIObject();
              _myUIObjects.push(myUIObject);
              canvas.addChild(myUIObject);
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              for (var iCol:int = 0; iCol < 40; iCol++) {
               myUIObject = _myUIObjects[iRow * 40 + iCol];
               myUIObject.x = iCol * 18;
               myUIObject.y = iRow * 18;
               myUIObject.width = 15;
               myUIObject.height = 15;
              _timer.addEventListener(TimerEvent.TIMER, handle_timer);
              _timer.start();
            private function handle_timer(event:Event):void
             for (var i:int = 0; i < 1200; i++) {
              MyUIObject(_myUIObjects[i]).invalidateDisplayList();
        ]]>
    </mx:Script>
    <mx:Canvas id="canvas" width="1000" height="1000"/>
</mx:Application>
package
import mx.core.UIComponent;
public class MyUIObject extends UIComponent
protected override function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
   this.graphics.beginFill(Math.random() * 500000);
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You are missing a call to graphics.clear(). Your code is actually adding
another fill on top of previously existing fills.

Huge memory leaks after upgrading from kernel 2.6.38(?)

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I think the leak has to come from inside the kernel because all sysmon apps claim no application is eating too much RAM yet the system memory consumption is at 100 % or even using swap. Even after I kill Xorg the memory usage will stay at least at 2.0 GB, when it should be less than half a gig.
I'd like to guess the blame is on Nouveau, because it was giving me a hell of a time back with Linux 2.6.39. It had a habit of freezing my system when re-enabling suspended compositing (both with Kwin and Mutter). Also video playback was corrupted sometimes. These probs have since been fixed with Linux 3.0.
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Last edited by Verge (2011-08-16 14:04:09)

OK, this kind of surprised me. No wonder I couldn't find any relevant stuff while googling for kernel issues. I have had Strigi disabled for some time now because it is miserably broken, but I now disabled the whole Nepomuk too. Let's see if my problem now goes away or what...
The release of KDE 4.7 Beta 1 actually lines up with the launch of Linux 2.6.39 so this really might be the case. I moved to KDE 4.7 already with the first beta.
Last edited by Verge (2011-08-16 14:30:37)

Suddenly, I'm getting a huge memory leak

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Also, sometimes Firefox will crash saying the Shockwave plugin quit. I have updated to the latest Flash plugin but it still happens.

The three Add-ons you mentioned are extensions (Firefox/Tools > Add-ons > Extensions).
Note that an extension like Firefox bug can cause issues with memory leaks.
If it works in Safe Mode and in normal mode with all extensions (Firefox/Tools > Add-ons > Extensions) disabled then try to find which extension is causing it by enabling one extension at a time until the problem reappears.
Close and restart Firefox after each change via "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: Firefox > Quit Firefox; Linux: Firefox/File > Quit)
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
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*https://support.mozilla.org/kb/Troubleshooting+plugins

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There is memory leak problem when select multi-rows table. Suppose that I don't make mistake when coding. Have U ever use Borland Delphi? In TQuery, there a field called UniDirectional when set it to True, selected rows aren't cached in Memory. So that There is must be a parameter in OCI does like UniDirectional does. There is any one know about it? reply this question or mail me directly at [email protected]
Thank in advance.

There is memory leak problem when select multi-rows table. Suppose that I don't make mistake when coding. Have U ever use Borland Delphi? In TQuery, there a field called UniDirectional when set it to True, selected rows aren't cached in Memory. So that There is must be a parameter in OCI does like UniDirectional does. There is any one know about it? reply this question or mail me directly at [email protected]
Thank in advance.

Huge Memory Leak!

I know there has been lots of discussion on the forum about leaks, but I've got a big one and it's not even an add on. I've got an executable that uses the DI. I use a recordset to select the code field for virtually all the 7,000 BOMs in OITT. I attach the recordset to the product tree object's browser to be able to loop through each bom, using the b1 object, like this:
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                        Try 'pgm has failed on move next !!!
                            'update bom line items' price list & unit price; update bom header pricelist too
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                            mReturnStatus.RtnCode = -1
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Inside that loop, I'm calling SetBomToMCL(bom, MCLPriceList) which receives the bom object byref & then changes the price list code on all the components, using a different record set to get the price on each component & then updates the price on the line item in a loop. I also update the bom price using the Items object. When I'm all done in that sub, I do release the com object stuff everyone recommends (for all the b1 objects used):
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                oItm = Nothing
                gc.collect
before returning to the main proc to read another row. It is still chewing up memory "like there is no tomorrow". It's about halfway through the boms & it's up to 1.2 Gigs! As I step through in debug mode, it's interesting that the lines of code where I loop through the oitm.pricelist to find the correct one to update, memory usage seems to go up on each line of code:
                                    For a As Integer = 0 To oItm.PriceList.Count - 1
                                        oItm.PriceList.SetCurrentLine(a)
                                        If oItm.PriceList.PriceList = MCLPriceList Then
                                            oItm.PriceList.Price = TotalPrice
                                            oItm.PriceList.Currency = "$"
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                                        End If
Does anyone have any idea what I am doing wrong? Desperate for help - THANK YOU!
Edited by: John Chadwick on Aug 28, 2008 2:59 PM

The proc is below. It does seem to take more memory for every iteration of the pricelist loop for the OITM object & that memory never seems to free up. I've never heard any talk about releasing "sub-objects" via the ReleaseComObject command, but should I be doing something like this?
System.Runtime.InteropServices.Marshal.ReleaseComObject(oItm.Pricelist)
oItm.Pricelist = nothing
System.Runtime.InteropServices.Marshal.ReleaseComObject(oItm)
oItm = nothing
I wouldn't think so, but who knows.
Actually, when debugging & watching the memory changes, the ReleaseComObject command, and setting the object to nothing has no immediate affect on memory, nor does the gc.collect, for that matter - I usually wait a minute for the gc. to do something. It really seems that anytime I read a record from a set, anywhere, it gobbles more memory (understandable) but never let's go.
Also, I don't know if I'd be better off using only one recordset in this sub, or making it/them global variables that I only instantiate once in the constructor? It seems to me that I've gotten NullReference exceptions in other code when the recordset object is used after a period of inactivity, even if it is a global variable that has been instantiated (only once).
Private Sub SetBomToMCL(ByRef BOM As ProductTrees, ByVal MCLPriceList As Short)
        Dim sql As String
        Dim rs, miscrs As Recordset
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        Dim parent As String
        Dim pricelistfail As Boolean
        Try
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                End If
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                'update the price list on the header record 'by hand' because field is not exposed.
                sql = String.Format("update oitt set pricelist = {0} where code = '{1}'", MCLPriceList, parent)
                miscrs = oCompany.GetBusinessObject(BoObjectTypes.BoRecordset)
                miscrs.DoQuery(sql)
                'Then check to make sure it was successful
                sql = String.Format("select pricelist from oitt where code = '{0}'", BOM.TreeCode)
                miscrs = oCompany.GetBusinessObject(BoObjectTypes.BoRecordset)
                miscrs.DoQuery(sql)
                If miscrs.Fields.Item("pricelist").Value <> MCLPriceList Then
                    logfile.WriteLogRecord("BOM header pricelist change failed for bom " & BOM.TreeCode & ": " & vbCrLf & vbTab & mReturnStatus.ToString)
                Else
                    'update the price list price for the parent bom (if it's a make part).
                    oItm = oCompany.GetBusinessObject(BoObjectTypes.oItems)
                    If oItm.GetByKey(parent) Then
                        If oItm.ProcurementMethod = BoProcurementMethod.bom_Make Then
                            If Not IsNothing(oItm.PriceList) Then
                                Try 'pgm is failing sometimes on " if oitm.pricelist.price = mclpricelist with object reference not pointing to instance of an object for some reason
                                    For a As Integer = 0 To oItm.PriceList.Count - 1
                                        oItm.PriceList.SetCurrentLine(a)
                                        If oItm.PriceList.PriceList = MCLPriceList Then
                                            oItm.PriceList.Price = TotalPrice
                                            oItm.PriceList.Currency = "$"
                                            Exit For
                                        End If
                                    Next
                                Catch ex As Exception
                                    pricelistfail = True
                                    logfile.WriteLogRecord(mReturnStatus.ToString)
                                End Try
                                If Not pricelistfail Then
                                    retval = oItm.Update
                                    If retval <> 0 Then
                                        logfile.WriteLogRecord(mReturnStatus.RtnMessage)
                                    End If
                                End If
                            Else
                                mReturnStatus.RtnMessage = -99
                                mReturnStatus.RtnMessage = ("Price List object is corrupt for item " & oItm.ItemCode & "(Object reference not set to an instance of an object)")
                            End If
                        End If
                    End If
                End If
            End If
        Catch ex As Exception
            logfile.WriteLogRecord(mReturnStatus.ToString)
        Finally
            If Not IsNothing(rs) Then
                System.Runtime.InteropServices.Marshal.ReleaseComObject(rs)
                rs = Nothing
            End If
            If Not IsNothing(miscrs) Then
                System.Runtime.InteropServices.Marshal.ReleaseComObject(miscrs)
                miscrs = Nothing
            End If
            If Not IsNothing(oItm) Then
                System.Runtime.InteropServices.Marshal.ReleaseComObject(oItm)
                oItm = Nothing
            End If
            GC.Collect()
        End Try
    End Sub
I have also gotten some strange errors in this program after it has been running for hours. I've been assuming that they've been caused by low memory, but I actually got a system.nullreferenceexception on this line:
                                        If oItm.PriceList.PriceList = MCLPriceList Then
And also, this message:                       '[Microsoft][SQL Native Client]Connection is busy with results for another command'
on this line (near the top of the sub):      rs.DoQuery(sql)
but it only occurs after it's been running for several hours. You'll note 'rs' is a local variable and it's used in a loop. I don't instantiate it each time in the loop.
Big problem, long message & I appreciate you taking a look.

Degree in Dynamic memory allocation need help!

I'm a student in the University of Bucharest in Computer-Science in the senior year. I'm looking for some specs for my degree in Dynamic memory allocation. In particular I was looking for specs about how the JVM heap and garbage collector work. Can you please direct me to someone how can help me find the necessary specs?
Thank you.

[http://java.sun.com/javase/technologies/hotspot/]
~

Huge Memory Leak - Need help.

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